Trending Floor Plan 1800 Square Foot House - So in addition to presenting our floor plans by number of bedrooms, we did a cataloging based on square footage. 4500 square foot house floor plan 4500 square foot building plan ground floor this house plan is on 4500 square feet and it has 4 u. Floor Plan 1800 Square Foot House / 381 x 251 jpeg 20 kb.